//
//  CZMainTabBar.swift
//  crkWeibo
//
//  Created by 陈荣科 on 15/12/16.
//  Copyright © 2015年 crk. All rights reserved.
//


import UIKit

class CZMainTabBar: UITabBar {
    

    
    //属性
    //5个子控件
    private let count = 5
    
    override func layoutSubviews() {
        //一定要记得调用父类的layoutsubviews
        super.layoutSubviews()
        
        //tabbar的宽度
        let width = self.bounds.width / CGFloat(count)
        
        //最左边的frame
        let frame = CGRect(x: 0, y: 0, width: width, height: self.bounds.height)
        
        var index = 0
        
        for view in self.subviews {
            
            if view is UIControl {
                view.frame = CGRect(x: CGFloat(index) * width, y: 0, width: width, height: self.bounds.height)
                
                index += index == 1 ? 2 : 1
            }
        }
        
        composeButton.frame = CGRectOffset(frame, 2.0 * width, 0)
    }
    
    lazy var composeButton: UIButton = {
    
        let button = UIButton()
        
        //设置UIButton的背景图片
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button"), forState: UIControlState.Normal)
        button.setBackgroundImage(UIImage(named: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        
        //设置UIbutton的按钮图片
        button.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        button.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        self.addSubview(button)
        
        return button;
    }()
    
    
}





